revision

Gwen is training for a marathon

and fueling her body with healthy food.

What kind of energy changes the food

into energy for her muscles?

• thermal

• solar

• physical

• chemical

Jonah and Rachel volunteer at the recycling center sorting and organizing recyclable objects. Jonah is sorting aluminum cans and crushing the cans to fit more in the bag. Rachel is sorting metal and steel objects into appropriate bins. Jonah realizes that even though he is crushing the cans, the amount of material in each can is unchanged. Rachel notices that many objects have rusted. Rusting is a chemical change that some metal and steel objects undergo when they are exposed to oxygen. Which option best describes a chemical change?

• a change in matter that produces one or more new substances

• a change from a liquid state to a gas state

• a change in form or appearance of matter

Teresa stays home from school because she has a cold. Her father makes her chicken noodle soup and urges her to drink lots of orange juice. Both the soup and juice are mixtures, but one is a homogeneous mixture and the other is heterogeneous. Which food item is homogeneous?

• Orange Juice

• Chicken Noodle Soup

Martina is camping and needs wood for a cooking fire as well as for shelter. She gathers a variety of logs and branches from the surrounding area. She chops and shapes some of the larger pieces of wood into uniform shapes to build her shelter. What kind of change is taking place as the wood is chopped?

• physical change

• chemical change

Fill in a word that correctly completes the sentence. Martina is camping and needs wood for a cooking fire as well as for shelter. She gathers a variety of logs and branches from the surrounding area. She burns some of the smaller twigs and branches to start a fire in order to cook her dinner. Burning wood is an example of a _______________change.

• physical

• chemical

Chocolate milk is a ______________.

• homogenous mixture

• heterogeneous mixture

Spaghetti and meatballs is a ___________________.

• homogenous mixture

• heterogeneous mixture

Coffee is a ___________________.

• homogenous mixture

• heterogeneous mixture

Min is conducting an experiment where he compares the properties of water and lemonade. The first stage of the experiment is focusing only on the physical properties of the water and lemonade. Which property would Min not use?

• color

• boiling point

• flammabiltiy